166951121 has 2 divisors, whose sum is σ = 166951122. Its totient is φ = 166951120.

The previous prime is 166951117. The next prime is 166951123. The reversal of 166951121 is 121159661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100300225 + 66650896 = 10015^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 166951121 - 2² = 166951117 is a prime.

It is a super-4 number, since 4×166951121⁴ (a number of 34 digits) contains 4444 as substring.

Together with 166951123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166951123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83475560 + 83475561.

It is an arithmetic number, because the mean of its divisors is an integer number (83475561).

Almost surely, 2^166951121 is an apocalyptic number.

It is an amenable number.

166951121 is a deficient number, since it is larger than the sum of its proper divisors (1).

166951121 is an equidigital number, since it uses as much as digits as its factorization.

166951121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 32.

The square root of 166951121 is about 12920.9566596286. The cubic root of 166951121 is about 550.6341127072.

The spelling of 166951121 in words is "one hundred sixty-six million, nine hundred fifty-one thousand, one hundred twenty-one".